Electronic filter circuit with feed back loop

Electronic circuit comprising a feedback loop added to a substantially linear transconductance amplifier, between two electronic leads having an input portion before the feedback loop and an output portion thereafter, characterised in that the feedback loop utilizes said substantially linear transconductance amplifier and comprises a frequency dependent element, a voltage to voltage conveyor part connected to each lead and two voltage subtractor elements, each connecting a lead to said transconductance amplifier, arranged for converting a current across said frequency dependent element to a voltage, and connecting to said voltage-to-voltage conveyor part.

Semiconductor chip comprising

• a feedback loop added to a substantially linear transconductance amplifier, between two electronic leads having an input portion before the feedback loop and an output portion thereafter, characterised in that the feedback loop utilizes said substantially linear transconductance amplifier, and comprises a frequency dependent element, a current to current conveyor part connected to each lead, and two current splitter elements, each connecting a lead to said transconductance amplifier, arranged for converting a voltage across said frequency dependent element to a current, and connecting to said current-to-current conveyor part, wherein the chip comprises a common mode loop, biasing an input stage to an electronic circuit and/or suppression of even order harmonics.

A semiconductor chip comprising a feedback loop added to a substantially linear transconductance amplifier, between two electronic leads having an input portion before the feedback loop and an output portion thereafter, characterised in that the feedback loop utilizes said substantially linear transconductance amplifier and comprises a frequency dependent element, a voltage to voltage conveyor part connected to each lead, and two voltage subtractor elements, each connecting a lead to said transconductance amplifier, arranged for converting a current across said frequency dependent element to a voltage, and connecting to said voltage-to-voltage conveyor part, wherein the chip comprises a common mode loop, biasing an input stage to an electronic circuit and/or suppression of even order harmonics.